Animals had begun to inhabit the land before plant species evolved.
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Q2: All chordates are vertebrates.
Q15: The early fish were jawless and armored,
Q16: Amphibians were the first organisms to live
Q17: The first vertebrates evolved on the land.
Q19: The pelycosaurs are the ancestral base for
Q21: The evolution of jaws played an important
Q22: Vertebrates first appeared in the _.
A) Cambrian
B)
Q23: Which of the following was critical for
Q24: Ostracoderms developed before cartilaginous fish.
Q25: Seedless vascular plants release spores to the
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